1. Department of Neurosurgery University of Health Sciences, Fatih Sultan Mehmet Research and Training Hospital Istanbul Turkey
2. Department of Neurosurgery Sivas Numune Hospital Sivas Turkey
3. Department of Radiology Yeditepe University School of Medicine Istanbul Turkey
4. Department of Neurosurgery University of Health Sciences, Bakirkoy Research and Training Hospital for Psychiatry, Neurology and Neurosurgery Istanbul Turkey